Morphology of Step-Wise S-N Curves Depending on Notch and Surface Roughness in High Strength Steel

2008 ◽  
pp. 1121-1122
Author(s):  
H. Itoga ◽  
K. Tokaji ◽  
M. Nakajima ◽  
H. N. Ko
Keyword(s):  
Surface Roughness ◽  
High Strength Steel ◽  
High Strength

Investigation of the High Strength Steel Al-Si Coating during Hot Stamping Operations

2009 ◽  
Vol 410-411 ◽  
pp. 289-296 ◽  
Author(s):  
Francesca Borsetto ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Surface Roughness ◽  
Cooling Rate ◽  
High Strength Steel ◽  
Room Temperature ◽  
Heating Temperature ◽  
Hot Stamping ◽  
High Strength ◽  
Tribological Behaviour ◽  
Metal Sheets ◽  
Coating Characteristics

To improve the low formability that HSS sheets exhibit at room temperature, innovative forming technologies like the hot stamping process are currently applied. In order to avoid scaling and decarburization during the heating step, metal sheets coated with a specially developed Al-Si coating are utilized. In the present work the coating characteristics in terms of morphology, surface roughness and tribological behaviour are investigated as function of heating temperature, holding time and cooling rate that are typical of hot stamping processes.

scholarly journals Effect of Surface Roughness on Step-Wise S-N Curve in High Strength Steel

2002 ◽  
Vol 2002.51 (0) ◽  
pp. 299-300
Author(s):  
Hisatake ITOGA ◽  
Keiro TOKAJI ◽  
Masaki NAKAJIMA ◽  
Haeng Nam KO
Keyword(s):  
Surface Roughness ◽  
High Strength Steel ◽  
High Strength ◽  
Effect Of Surface

Experimental Study on the Relationship between Surface Roughness and Cutting Parameters when Face Milling High Strength Steel

2010 ◽  
Vol 139-141 ◽  
pp. 782-787
Author(s):  
Yue Ding ◽  
Wei Liu ◽  
Xi Bin Wang ◽  
Li Jing Xie ◽  
Jun Han
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
High Strength Steel ◽  
Cutting Speed ◽  
High Strength ◽  
Face Milling ◽  
Depth Of Cut ◽  
Radial Depth ◽  
The Relationship ◽  
Axial Depth

In this study, surface roughness generated by face milling of 38CrSi high-strength steel is discussed. Experiments based on 24 factorial design and Box-Behnken design method are conducted to investigate the effects of milling parameters (cutting speed, axial depth of cut and radial depth of cut and feed rate) on surface roughness, and a second-order model of surface roughness is established by using surface response methodology (RSM); Significance tests of the model are carried out by the analysis of variance (ANOVA). The results show that the most important cutting parameter is feed rate, followed by radial depth of cut, cutting speed and axial depth of cut. Moreover, it is verified that the predictive model possesses highly significance by the variance examination at a level of confidence of 99%. And the relationship between surface roughness and the important interaction terms is nonlinear.

Cutting force, tool wear and surface roughness in high-speed milling of high-strength steel with coated tools

2019 ◽  
Vol 33 (11) ◽  
pp. 5393-5398 ◽  
Author(s):  
Yuan Li ◽  
Guangming Zheng ◽  
Xu Zhang ◽  
Xiang Cheng ◽  
Xianhai Yang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Cutting Force ◽  
High Strength Steel ◽  
High Speed ◽  
High Strength ◽  
High Speed Milling ◽  
Coated Tools

scholarly journals Prediction Model of Cutting Parameters for Turning High Strength Steel Grade-H: Comparative Study of Regression Model versus ANFIS

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Adel T. Abbas ◽  
Mohanad Alata ◽  
Adham E. Ragab ◽  
Magdy M. El Rayes ◽  
Ehab A. El Danaf
Keyword(s):  
Experimental Data ◽  
Surface Roughness ◽  
Regression Analysis ◽  
High Strength Steel ◽  
Removal Rate ◽  
High Strength ◽  
Cutting Parameters ◽  
Turning Operations ◽  
Cnc Turning ◽  
Accuracy And Repeatability

The Grade-H high strength steel is used in the manufacturing of many civilian and military products. The procedures of manufacturing these parts have several turning operations. The key factors for the manufacturing of these parts are the accuracy, surface roughness (Ra), and material removal rate (MRR). The production line of these parts contains many CNC turning machines to get good accuracy and repeatability. The manufacturing engineer should fulfill the required surface roughness value according to the design drawing from first trail (otherwise these parts will be rejected) as well as keeping his eye on maximum metal removal rate. The rejection of these parts at any processing stage will represent huge problems to any factory because the processing and raw material of these parts are very expensive. In this paper the artificial neural network was used for predicting the surface roughness for different cutting parameters in CNC turning operations. These parameters were investigated to get the minimum surface roughness. In addition, a mathematical model for surface roughness was obtained from the experimental data using a regression analysis method. The experimental data are then compared with both the regression analysis results and ANFIS (Adaptive Network-based Fuzzy Inference System) estimations.

Experimental Study on Cryogenic Cutting of High-Strength Steel with Liquid Nitrogen Cooling

2011 ◽  
Vol 328-330 ◽  
pp. 470-473 ◽  
Author(s):  
Shu Juan Li ◽  
Yong Ke Hu ◽  
Xue Jiang ◽  
Juan Du
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
High Strength Steel ◽  
Cutting Speed ◽  
High Strength ◽  
Dry Cutting ◽  
Chip Breaking ◽  
Cryogenic Cutting ◽  
Hard Cutting ◽  
Made In

As a modern manufacturing technology, cryogenic cutting technology is one of effective ways to improve machining efficiency of hard-cutting materials.With typical hard-cutting materials 35CrMnSiA and 45CrNiMoV high-strength steel as the research object, the comparison experiment between cryogenic cutting and dry cutting of two kinds of high-strength steels was made in this paper. In the changing cutting speed conditions, the cutting force and the surface roughness of two kinds of cutting were measured in this experiment.By changing the length of cutting stroke, the cutter wear of two kinds of cutting was measured, and a comparison of chip-breaking effects was made in the experiment.The experimental results indicate that the cutting force, surface roughness, and tool wear in cutting 35CrMnSiA and 45CrNiMoV high-strength steel under cryogenic condition are reduced, and chip-breaking effect of cryogenic cutting is improved. This may be attributed mainly to improve the machinability of higth-strength steel.

scholarly journals Surface Integrity and Corrosion Resistance of 42CrMo4 High-Strength Steel Strengthened by Hard Turning

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6995
Author(s):  
Qingzhong Xu ◽  
Yan Liu ◽  
Haiyang Lu ◽  
Jichen Liu ◽  
Gangjun Cai
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Compressive Stress ◽  
Surface Integrity ◽  
High Strength Steel ◽  
Hard Turning ◽  
High Strength ◽  
Residual Compressive Stress ◽  
Surface Microhardness ◽  
Surface Corrosion

To improve the surface corrosion resistance of 42CrMo4 high-strength steel used in a marine environment, this article studied the effects of hard turning on the surface integrity and corrosion resistance of 42CrMo4 high-strength steel through the single factor experimental method, namely hard turning, polarization corrosion, electrochemical impedance spectroscopy, potentiodynamic polarization curve, and salt spray tests. The results indicated that the surface integrity was modified by the hard turning, with a surface roughness lower than Ra 0.8 μm, decreased surface microhardness, fine and uniform surface microstructure, and dominant surface residual compressive stress. The hard turning process was feasible to strengthen the surface corrosion resistance of 42CrMo4 high-strength steel. The better corrosion resistance of the surface layer than that of the substrate material can be ascribed to the uniform carbides and compact microstructure. The corrosion resistance varied with cutting speeds as a result of the changed surface microhardness and residual compressive stress, varied with feed rates as a result of the changed surface roughness, and varied with cutting depths as a result of the changed surface residual compressive stress, respectively. The surface integrity with smaller surface roughness and microhardness and bigger surface residual compressive stress was beneficial for corrosion resistance.

Experimental Study on Milling Parameters Regression and Optimization of Super High Strength Steel 30CrMnSiNi2A

2012 ◽  
Vol 723 ◽  
pp. 293-298 ◽  
Author(s):  
Ming Chen ◽  
Cheng Dong Wang ◽  
Li Jiang ◽  
Qiu Lin Niu
Keyword(s):  
Surface Roughness ◽  
Regression Model ◽  
Cutting Force ◽  
High Strength Steel ◽  
Metal Removal ◽  
Removal Rate ◽  
Multiple Linear Regression Model ◽  
High Strength ◽  
Parameters Optimization ◽  
Milling Parameters

In this paper, effects of milling parameters on cutting force and surface roughness during symmetrical face dry milling process of super high strength steel 30CrMnSiNi2A were presented. Multiple linear regression model and orthogonal rotary quadratic regression model were established to analyze cutting force and surface roughness, respectively. Their adequacy was estimated by variance analysis and experimental data comparison. Parameters optimization for maximum metal removal rate and minimum surface roughness were also discussed.

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